const { src, dest, parallel, series, watch } = require('gulp')
const loadPlugins = require('gulp-load-plugins')
const browserSync = require('browser-sync')
const plugins = loadPlugins()
const del = require('del')
const bs = browserSync.create()
// 清除
const clean = () => {
    return del(['dist','temp'])
}
const style = () => {
    return src('src/assets/styles/*.scss', { base: 'src' })//保留src后的目录
        .pipe(plugins.sass({ outputStyle: 'expanded' }))
        .pipe(dest('temp'))
        .pipe(bs.reload({ stream: true }))//以流的方式往浏览器上推
}
// 脚本编译
const script = () => {
    return src('src/assets/scripts/*.js', { base: 'src' })
        .pipe(plugins.babel({ presets: ['@babel/preset-env'] }))
        .pipe(dest('temp'))
        .pipe(bs.reload({ stream: true }))//以流的方式往浏览器上推
}
// 页面模板文件的编译
const page = () => {
    return src('src/*.html', { base: 'src' })
        .pipe(plugins.swig())
        .pipe(dest('temp'))
        .pipe(bs.reload({ stream: true }))//以流的方式往浏览器上推
}
// 图片压缩
const image = () => {
    return src('src/assets/images/**', { base: 'src' })
        .pipe(plugins.imagemin())
        .pipe(dest('dist'))
        .pipe(bs.reload({ stream: true }))//以流的方式往浏览器上推

}
const font = () => {
    return src('src/assets/fonts/**', { base: 'src' })
        .pipe(plugins.imagemin())
        .pipe(dest('dist'))
        .pipe(bs.reload({ stream: true }))//以流的方式往浏览器上推
}
const extra = () => {
    return src('public/**', { base: 'public' })
        .pipe(dest('dist'))
        .pipe(bs.reload({ stream: true }))//以流的方式往浏览器上推
}
const useref = () => {
    return src('temp/*.html', { base:  'dist' })
    .pipe(plugins.useref({searchPath:['dist','.']}))
    .pipe(plugins.if(/\.js$/,plugins.uglify()))
    .pipe(plugins.if(/\.html$/,plugins.htmlmin({
        collapseWhitespace:true,
        minifyCSS:true,
        minifyJS:true
    })))
    .pipe(plugins.if(/\.css$/,plugins.cleanCss()))
    // html  js css
    .pipe(dest('dist'))
}
const serve = () => {
    watch('src/assets/styles/*.scss', style)
    watch('src/assets/scripts/*.js', script)
    watch('src/*.html', page)
    watch([
        'src/assets/images/**',
        'src/assets/fonts/**',
        'public/**',
    ], bs.reload)
    bs.init({
        notify: false,
        // files: 'dist/**',
        server: {
            baseDir: ['temp', 'src', 'public'],
            routes: {
                '/node_modules': 'node_modules'///所有/node_modules都指向node_modules
            }
        }
    })
}
const compile = parallel(style, script, page)
const build = series(clean, parallel(series(compile,useref) , image, font, extra))
const develop = series(compile, serve)
module.exports = {
    clean,
    build,
    develop,
 
}